/* Derived from Applicom driver ac.c for SCO Unix                            */
  /* Ported by David Woodhouse, Axiom (Cambridge) Ltd.                         */
  /* dwmw2@infradead.org 30/8/98                                               */
  /* $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $			     */
  /* This module is for Linux 2.1 and 2.2 series kernels.                      */
  /*****************************************************************************/
  /* J PAGET 18/02/94 passage V2.4.2 ioctl avec code 2 reset to les interrupt  */
  /* ceci pour reseter correctement apres une sortie sauvage                   */
  /* J PAGET 02/05/94 passage V2.4.3 dans le traitement de d'interruption,     */
  /* LoopCount n'etait pas initialise a 0.                                     */
  /* F LAFORSE 04/07/95 version V2.6.0 lecture bidon apres acces a une carte   */
  /*           pour liberer le bus                                             */
  /* J.PAGET 19/11/95 version V2.6.1 Nombre, addresse,irq n'est plus configure */
  /* et passe en argument a acinit, mais est scrute sur le bus pour s'adapter  */
  /* au nombre de cartes presentes sur le bus. IOCL code 6 affichait V2.4.3    */
  /* F.LAFORSE 28/11/95 creation de fichiers acXX.o avec les differentes       */

  /* addresses de base des cartes, IOCTL 6 plus complet                         */

  /* J.PAGET le 19/08/96 copie de la version V2.6 en V2.8.0 sans modification  */
  /* de code autre que le texte V2.6.1 en V2.8.0                               */
  /*****************************************************************************/
  
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/interrupt.h>

  #include <linux/sched/signal.h>

  #include <linux/slab.h>
  #include <linux/errno.h>

  #include <linux/mutex.h>

  #include <linux/miscdevice.h>
  #include <linux/pci.h>
  #include <linux/wait.h>
  #include <linux/init.h>
  #include <linux/fs.h>
  
  #include <asm/io.h>

  #include <linux/uaccess.h>

  
  #include "applicom.h"
  
  
  /* NOTE: We use for loops with {write,read}b() instead of 
     memcpy_{from,to}io throughout this driver. This is because
     the board doesn't correctly handle word accesses - only
     bytes. 
  */
  
  
  #undef DEBUG
  
  #define MAX_BOARD 8		/* maximum of pc board possible */
  #define MAX_ISA_BOARD 4
  #define LEN_RAM_IO 0x800
  #define AC_MINOR 157
  
  #ifndef PCI_VENDOR_ID_APPLICOM
  #define PCI_VENDOR_ID_APPLICOM                0x1389
  #define PCI_DEVICE_ID_APPLICOM_PCIGENERIC     0x0001
  #define PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN 0x0002
  #define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
  #endif

  static DEFINE_MUTEX(ac_mutex);

  static char *applicom_pci_devnames[] = {
  	"PCI board",
  	"PCI2000IBS / PCI2000CAN",
  	"PCI2000PFB"
  };

  static const struct pci_device_id applicom_pci_tbl[] = {

  	{ PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCIGENERIC) },
  	{ PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN) },
  	{ PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000PFB) },

  	{ 0 }
  };
  MODULE_DEVICE_TABLE(pci, applicom_pci_tbl);
  
  MODULE_AUTHOR("David Woodhouse & Applicom International");
  MODULE_DESCRIPTION("Driver for Applicom Profibus card");
  MODULE_LICENSE("GPL");

  MODULE_ALIAS_MISCDEV(AC_MINOR);

  
  MODULE_SUPPORTED_DEVICE("ac");
  
  
  static struct applicom_board {
  	unsigned long PhysIO;
  	void __iomem *RamIO;
  	wait_queue_head_t FlagSleepSend;
  	long irq;
  	spinlock_t mutex;
  } apbs[MAX_BOARD];
  
  static unsigned int irq = 0;	/* interrupt number IRQ       */
  static unsigned long mem = 0;	/* physical segment of board  */

  module_param_hw(irq, uint, irq, 0);

  MODULE_PARM_DESC(irq, "IRQ of the Applicom board");

  module_param_hw(mem, ulong, iomem, 0);

  MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");
  
  static unsigned int numboards;	/* number of installed boards */
  static volatile unsigned char Dummy;
  static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
  static unsigned int WriteErrorCount;	/* number of write error      */
  static unsigned int ReadErrorCount;	/* number of read error       */
  static unsigned int DeviceErrorCount;	/* number of device error     */
  
  static ssize_t ac_read (struct file *, char __user *, size_t, loff_t *);
  static ssize_t ac_write (struct file *, const char __user *, size_t, loff_t *);

  static long ac_ioctl(struct file *, unsigned int, unsigned long);

  static irqreturn_t ac_interrupt(int, void *);

  static const struct file_operations ac_fops = {

  	.owner = THIS_MODULE,
  	.llseek = no_llseek,
  	.read = ac_read,
  	.write = ac_write,

  	.unlocked_ioctl = ac_ioctl,

  };
  
  static struct miscdevice ac_miscdev = {
  	AC_MINOR,
  	"ac",
  	&ac_fops
  };
  
  static int dummy;	/* dev_id for request_irq() */
  
  static int ac_register_board(unsigned long physloc, void __iomem *loc, 
  		      unsigned char boardno)
  {
  	volatile unsigned char byte_reset_it;
  
  	if((readb(loc + CONF_END_TEST)     != 0x00) ||
  	   (readb(loc + CONF_END_TEST + 1) != 0x55) ||
  	   (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
  	   (readb(loc + CONF_END_TEST + 3) != 0xFF))
  		return 0;
  
  	if (!boardno)
  		boardno = readb(loc + NUMCARD_OWNER_TO_PC);

  	if (!boardno || boardno > MAX_BOARD) {

  		printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).
  ",
  		       boardno, physloc, MAX_BOARD);
  		return 0;
  	}
  
  	if (apbs[boardno - 1].RamIO) {
  		printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)
  ", 
  		       boardno, physloc, boardno, apbs[boardno-1].PhysIO);
  		return 0;
  	}
  
  	boardno--;
  
  	apbs[boardno].PhysIO = physloc;
  	apbs[boardno].RamIO = loc;
  	init_waitqueue_head(&apbs[boardno].FlagSleepSend);
  	spin_lock_init(&apbs[boardno].mutex);
  	byte_reset_it = readb(loc + RAM_IT_TO_PC);
  
  	numboards++;
  	return boardno + 1;
  }

  static void __exit applicom_exit(void)

  {

  	unsigned int i;

  
  	misc_deregister(&ac_miscdev);
  
  	for (i = 0; i < MAX_BOARD; i++) {
  
  		if (!apbs[i].RamIO)
  			continue;
  
  		if (apbs[i].irq)
  			free_irq(apbs[i].irq, &dummy);
  
  		iounmap(apbs[i].RamIO);
  	}
  }

  static int __init applicom_init(void)

  {
  	int i, numisa = 0;
  	struct pci_dev *dev = NULL;
  	void __iomem *RamIO;

  	int boardno, ret;

  
  	printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $
  ");
  
  	/* No mem and irq given - check for a PCI card */
  
  	while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {

  		if (!pci_match_id(applicom_pci_tbl, dev))

  			continue;
  		
  		if (pci_enable_device(dev))
  			return -EIO;

  		RamIO = ioremap_nocache(pci_resource_start(dev, 0), LEN_RAM_IO);

  
  		if (!RamIO) {

  			printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
  				"space at 0x%llx
  ",

  				(unsigned long long)pci_resource_start(dev, 0));

  			pci_disable_device(dev);
  			return -EIO;
  		}

  		printk(KERN_INFO "Applicom %s found at mem 0x%llx, irq %d
  ",
  		       applicom_pci_devnames[dev->device-1],

  			   (unsigned long long)pci_resource_start(dev, 0),

  		       dev->irq);

  		boardno = ac_register_board(pci_resource_start(dev, 0),
  				RamIO, 0);

  		if (!boardno) {
  			printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.
  ");
  			iounmap(RamIO);
  			pci_disable_device(dev);
  			continue;
  		}

  		if (request_irq(dev->irq, &ac_interrupt, IRQF_SHARED, "Applicom PCI", &dummy)) {

  			printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.
  ", dev->irq);
  			iounmap(RamIO);
  			pci_disable_device(dev);
  			apbs[boardno - 1].RamIO = NULL;
  			continue;
  		}
  
  		/* Enable interrupts. */
  
  		writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);
  
  		apbs[boardno - 1].irq = dev->irq;
  	}
  
  	/* Finished with PCI cards. If none registered, 
  	 * and there was no mem/irq specified, exit */
  
  	if (!mem || !irq) {
  		if (numboards)
  			goto fin;
  		else {
  			printk(KERN_INFO "ac.o: No PCI boards found.
  ");
  			printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.
  ");
  			return -ENXIO;
  		}
  	}
  
  	/* Now try the specified ISA cards */
  
  	for (i = 0; i < MAX_ISA_BOARD; i++) {

  		RamIO = ioremap_nocache(mem + (LEN_RAM_IO * i), LEN_RAM_IO);

  
  		if (!RamIO) {
  			printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)
  ", i + 1);
  			continue;
  		}
  
  		if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
  						  RamIO,i+1))) {
  			iounmap(RamIO);
  			continue;
  		}
  
  		printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d
  ", mem + (LEN_RAM_IO*i), irq);
  
  		if (!numisa) {

  			if (request_irq(irq, &ac_interrupt, IRQF_SHARED, "Applicom ISA", &dummy)) {

  				printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.
  ", irq);
  				iounmap(RamIO);
  				apbs[boardno - 1].RamIO = NULL;
  			}
  			else
  				apbs[boardno - 1].irq = irq;
  		}
  		else
  			apbs[boardno - 1].irq = 0;
  
  		numisa++;
  	}
  
  	if (!numisa)

  		printk(KERN_WARNING "ac.o: No valid ISA Applicom boards found "
  				"at mem 0x%lx
  ", mem);

  
   fin:
  	init_waitqueue_head(&FlagSleepRec);
  
  	WriteErrorCount = 0;
  	ReadErrorCount = 0;
  	DeviceErrorCount = 0;
  
  	if (numboards) {

  		ret = misc_register(&ac_miscdev);
  		if (ret) {
  			printk(KERN_WARNING "ac.o: Unable to register misc device
  ");
  			goto out;
  		}

  		for (i = 0; i < MAX_BOARD; i++) {
  			int serial;
  			char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
  
  			if (!apbs[i].RamIO)
  				continue;
  
  			for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
  				boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
  
  			boardname[serial] = 0;
  
  
  			printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
  			       i+1, boardname,
  			       (int)(readb(apbs[i].RamIO + VERS) >> 4),
  			       (int)(readb(apbs[i].RamIO + VERS) & 0xF));
  			
  			serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) + 
  				(readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) + 
  				(readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
  
  			if (serial != 0)
  				printk(" S/N %d
  ", serial);
  			else
  				printk("
  ");
  		}
  		return 0;
  	}
  
  	else
  		return -ENXIO;

  
  out:
  	for (i = 0; i < MAX_BOARD; i++) {
  		if (!apbs[i].RamIO)
  			continue;
  		if (apbs[i].irq)
  			free_irq(apbs[i].irq, &dummy);
  		iounmap(apbs[i].RamIO);
  	}

  	return ret;

  }

  module_init(applicom_init);
  module_exit(applicom_exit);

  
  static ssize_t ac_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
  {
  	unsigned int NumCard;	/* Board number 1 -> 8           */
  	unsigned int IndexCard;	/* Index board number 0 -> 7     */
  	unsigned char TicCard;	/* Board TIC to send             */
  	unsigned long flags;	/* Current priority              */
  	struct st_ram_io st_loc;
  	struct mailbox tmpmailbox;
  #ifdef DEBUG
  	int c;
  #endif
  	DECLARE_WAITQUEUE(wait, current);
  
  	if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
  		static int warncount = 5;
  		if (warncount) {
  			printk(KERN_INFO "Hmmm. write() of Applicom card, length %zd != expected %zd
  ",
  			       count, sizeof(struct st_ram_io) + sizeof(struct mailbox));
  			warncount--;
  		}
  		return -EINVAL;
  	}
  
  	if(copy_from_user(&st_loc, buf, sizeof(struct st_ram_io))) 
  		return -EFAULT;
  	
  	if(copy_from_user(&tmpmailbox, &buf[sizeof(struct st_ram_io)],
  			  sizeof(struct mailbox))) 
  		return -EFAULT;
  
  	NumCard = st_loc.num_card;	/* board number to send          */
  	TicCard = st_loc.tic_des_from_pc;	/* tic number to send            */
  	IndexCard = NumCard - 1;
  
  	if((NumCard < 1) || (NumCard > MAX_BOARD) || !apbs[IndexCard].RamIO)
  		return -EINVAL;
  
  #ifdef DEBUG
  	printk("Write to applicom card #%d. struct st_ram_io follows:",
  	       IndexCard+1);
  
  		for (c = 0; c < sizeof(struct st_ram_io);) {
  		
  			printk("
  %5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);
  
  			for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
  				printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
  			}
  		}
  
  		printk("
  struct mailbox follows:");
  
  		for (c = 0; c < sizeof(struct mailbox);) {
  			printk("
  %5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);
  
  			for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
  				printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
  			}
  		}
  
  		printk("
  ");
  #endif
  
  	spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
  
  	/* Test octet ready correct */
  	if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) { 
  		Dummy = readb(apbs[IndexCard].RamIO + VERS);
  		spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
  		printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d
  ",
  		       IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
  		DeviceErrorCount++;
  		return -EIO;
  	}
  	
  	/* Place ourselves on the wait queue */
  	set_current_state(TASK_INTERRUPTIBLE);
  	add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
  
  	/* Check whether the card is ready for us */
  	while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
  		Dummy = readb(apbs[IndexCard].RamIO + VERS);
  		/* It's busy. Sleep. */
  
  		spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
  		schedule();
  		if (signal_pending(current)) {
  			remove_wait_queue(&apbs[IndexCard].FlagSleepSend,
  					  &wait);
  			return -EINTR;
  		}
  		spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
  		set_current_state(TASK_INTERRUPTIBLE);
  	}
  
  	/* We may not have actually slept */
  	set_current_state(TASK_RUNNING);
  	remove_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
  
  	writeb(1, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
  
  	/* Which is best - lock down the pages with rawio and then
  	   copy directly, or use bounce buffers? For now we do the latter 
  	   because it works with 2.2 still */
  	{
  		unsigned char *from = (unsigned char *) &tmpmailbox;
  		void __iomem *to = apbs[IndexCard].RamIO + RAM_FROM_PC;
  		int c;
  
  		for (c = 0; c < sizeof(struct mailbox); c++)
  			writeb(*(from++), to++);
  	}
  
  	writeb(0x20, apbs[IndexCard].RamIO + TIC_OWNER_FROM_PC);
  	writeb(0xff, apbs[IndexCard].RamIO + NUMCARD_OWNER_FROM_PC);
  	writeb(TicCard, apbs[IndexCard].RamIO + TIC_DES_FROM_PC);
  	writeb(NumCard, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
  	writeb(2, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
  	writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
  	Dummy = readb(apbs[IndexCard].RamIO + VERS);
  	spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
  	return 0;
  }
  
  static int do_ac_read(int IndexCard, char __user *buf,
  		struct st_ram_io *st_loc, struct mailbox *mailbox)
  {
  	void __iomem *from = apbs[IndexCard].RamIO + RAM_TO_PC;

  	unsigned char *to = (unsigned char *)mailbox;

  #ifdef DEBUG
  	int c;
  #endif
  
  	st_loc->tic_owner_to_pc = readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC);
  	st_loc->numcard_owner_to_pc = readb(apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
  
  
  	{
  		int c;
  
  		for (c = 0; c < sizeof(struct mailbox); c++)
  			*(to++) = readb(from++);
  	}
  	writeb(1, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
  	writeb(1, apbs[IndexCard].RamIO + TYP_ACK_FROM_PC);
  	writeb(IndexCard+1, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
  	writeb(readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC), 
  	       apbs[IndexCard].RamIO + TIC_ACK_FROM_PC);
  	writeb(2, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
  	writeb(0, apbs[IndexCard].RamIO + DATA_TO_PC_READY);
  	writeb(2, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
  	Dummy = readb(apbs[IndexCard].RamIO + VERS);
  
  #ifdef DEBUG
  		printk("Read from applicom card #%d. struct st_ram_io follows:", NumCard);
  
  		for (c = 0; c < sizeof(struct st_ram_io);) {
  			printk("
  %5.5X: %2.2X", c, ((unsigned char *)st_loc)[c]);
  
  			for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
  				printk(" %2.2X", ((unsigned char *)st_loc)[c]);
  			}
  		}
  
  		printk("
  struct mailbox follows:");
  
  		for (c = 0; c < sizeof(struct mailbox);) {
  			printk("
  %5.5X: %2.2X", c, ((unsigned char *)mailbox)[c]);
  
  			for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
  				printk(" %2.2X", ((unsigned char *)mailbox)[c]);
  			}
  		}
  		printk("
  ");
  #endif
  	return (sizeof(struct st_ram_io) + sizeof(struct mailbox));
  }
  
  static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_t *ptr)
  {
  	unsigned long flags;
  	unsigned int i;
  	unsigned char tmp;
  	int ret = 0;
  	DECLARE_WAITQUEUE(wait, current);
  #ifdef DEBUG
  	int loopcount=0;
  #endif
  	/* No need to ratelimit this. Only root can trigger it anyway */
  	if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
  		printk( KERN_WARNING "Hmmm. read() of Applicom card, length %zd != expected %zd
  ",
  			count,sizeof(struct st_ram_io) + sizeof(struct mailbox));
  		return -EINVAL;
  	}
  	
  	while(1) {
  		/* Stick ourself on the wait queue */
  		set_current_state(TASK_INTERRUPTIBLE);
  		add_wait_queue(&FlagSleepRec, &wait);
  		
  		/* Scan each board, looking for one which has a packet for us */
  		for (i=0; i < MAX_BOARD; i++) {
  			if (!apbs[i].RamIO)
  				continue;
  			spin_lock_irqsave(&apbs[i].mutex, flags);
  			
  			tmp = readb(apbs[i].RamIO + DATA_TO_PC_READY);
  			
  			if (tmp == 2) {
  				struct st_ram_io st_loc;
  				struct mailbox mailbox;
  
  				/* Got a packet for us */

  				memset(&st_loc, 0, sizeof(st_loc));

  				ret = do_ac_read(i, buf, &st_loc, &mailbox);
  				spin_unlock_irqrestore(&apbs[i].mutex, flags);
  				set_current_state(TASK_RUNNING);
  				remove_wait_queue(&FlagSleepRec, &wait);
  
  				if (copy_to_user(buf, &st_loc, sizeof(st_loc)))
  					return -EFAULT;
  				if (copy_to_user(buf + sizeof(st_loc), &mailbox, sizeof(mailbox)))
  					return -EFAULT;
  				return tmp;
  			}
  			
  			if (tmp > 2) {
  				/* Got an error */
  				Dummy = readb(apbs[i].RamIO + VERS);
  				
  				spin_unlock_irqrestore(&apbs[i].mutex, flags);
  				set_current_state(TASK_RUNNING);
  				remove_wait_queue(&FlagSleepRec, &wait);
  				
  				printk(KERN_WARNING "APPLICOM driver read error board %d, DataToPcReady = %d
  ",
  				       i,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
  				DeviceErrorCount++;
  				return -EIO;
  			}
  			
  			/* Nothing for us. Try the next board */
  			Dummy = readb(apbs[i].RamIO + VERS);
  			spin_unlock_irqrestore(&apbs[i].mutex, flags);
  			
  		} /* per board */
  
  		/* OK - No boards had data for us. Sleep now */
  
  		schedule();
  		remove_wait_queue(&FlagSleepRec, &wait);
  
  		if (signal_pending(current))
  			return -EINTR;
  
  #ifdef DEBUG
  		if (loopcount++ > 2) {

  			printk(KERN_DEBUG "Looping in ac_read. loopcount %d
  ", loopcount);

  		}
  #endif
  	} 
  }

  static irqreturn_t ac_interrupt(int vec, void *dev_instance)

  {
  	unsigned int i;
  	unsigned int FlagInt;
  	unsigned int LoopCount;
  	int handled = 0;
  
  	//    printk("Applicom interrupt on IRQ %d occurred
  ", vec);
  
  	LoopCount = 0;
  
  	do {
  		FlagInt = 0;
  		for (i = 0; i < MAX_BOARD; i++) {
  			
  			/* Skip if this board doesn't exist */
  			if (!apbs[i].RamIO)
  				continue;
  
  			spin_lock(&apbs[i].mutex);
  
  			/* Skip if this board doesn't want attention */
  			if(readb(apbs[i].RamIO + RAM_IT_TO_PC) == 0) {
  				spin_unlock(&apbs[i].mutex);
  				continue;
  			}
  
  			handled = 1;
  			FlagInt = 1;
  			writeb(0, apbs[i].RamIO + RAM_IT_TO_PC);
  
  			if (readb(apbs[i].RamIO + DATA_TO_PC_READY) > 2) {
  				printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataToPcReady = %d
  ",
  				       i+1,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
  				DeviceErrorCount++;
  			}
  
  			if((readb(apbs[i].RamIO + DATA_FROM_PC_READY) > 2) && 
  			   (readb(apbs[i].RamIO + DATA_FROM_PC_READY) != 6)) {
  				
  				printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataFromPcReady = %d
  ",
  				       i+1,(int)readb(apbs[i].RamIO + DATA_FROM_PC_READY));
  				DeviceErrorCount++;
  			}
  
  			if (readb(apbs[i].RamIO + DATA_TO_PC_READY) == 2) {	/* mailbox sent by the card ?   */
  				if (waitqueue_active(&FlagSleepRec)) {
  				wake_up_interruptible(&FlagSleepRec);
  			}
  			}
  
  			if (readb(apbs[i].RamIO + DATA_FROM_PC_READY) == 0) {	/* ram i/o free for write by pc ? */
  				if (waitqueue_active(&apbs[i].FlagSleepSend)) {	/* process sleep during read ?    */
  					wake_up_interruptible(&apbs[i].FlagSleepSend);
  				}
  			}
  			Dummy = readb(apbs[i].RamIO + VERS);
  
  			if(readb(apbs[i].RamIO + RAM_IT_TO_PC)) {
  				/* There's another int waiting on this card */
  				spin_unlock(&apbs[i].mutex);
  				i--;
  			} else {
  				spin_unlock(&apbs[i].mutex);
  			}
  		}
  		if (FlagInt)
  			LoopCount = 0;
  		else
  			LoopCount++;
  	} while(LoopCount < 2);
  	return IRQ_RETVAL(handled);
  }

  static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

       
  {				/* @ ADG ou ATO selon le cas */
  	int i;
  	unsigned char IndexCard;
  	void __iomem *pmem;
  	int ret = 0;
  	volatile unsigned char byte_reset_it;
  	struct st_ram_io *adgl;
  	void __user *argp = (void __user *)arg;
  
  	/* In general, the device is only openable by root anyway, so we're not
  	   particularly concerned that bogus ioctls can flood the console. */

  	adgl = memdup_user(argp, sizeof(struct st_ram_io));
  	if (IS_ERR(adgl))
  		return PTR_ERR(adgl);

  	mutex_lock(&ac_mutex);	

  	IndexCard = adgl->num_card-1;
  	 

  	if(cmd != 6 && ((IndexCard >= MAX_BOARD) || !apbs[IndexCard].RamIO)) {

  		static int warncount = 10;
  		if (warncount) {
  			printk( KERN_WARNING "APPLICOM driver IOCTL, bad board number %d
  ",(int)IndexCard+1);
  			warncount--;
  		}
  		kfree(adgl);

  		mutex_unlock(&ac_mutex);

  		return -EINVAL;
  	}
  
  	switch (cmd) {
  		
  	case 0:
  		pmem = apbs[IndexCard].RamIO;
  		for (i = 0; i < sizeof(struct st_ram_io); i++)
  			((unsigned char *)adgl)[i]=readb(pmem++);
  		if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
  			ret = -EFAULT;
  		break;
  	case 1:
  		pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
  		for (i = 0; i < 4; i++)
  			adgl->conf_end_test[i] = readb(pmem++);
  		for (i = 0; i < 2; i++)
  			adgl->error_code[i] = readb(pmem++);
  		for (i = 0; i < 4; i++)
  			adgl->parameter_error[i] = readb(pmem++);
  		pmem = apbs[IndexCard].RamIO + VERS;
  		adgl->vers = readb(pmem);
  		pmem = apbs[IndexCard].RamIO + TYPE_CARD;
  		for (i = 0; i < 20; i++)
  			adgl->reserv1[i] = readb(pmem++);
  		*(int *)&adgl->reserv1[20] =  
  			(readb(apbs[IndexCard].RamIO + SERIAL_NUMBER) << 16) + 
  			(readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 1) << 8) + 
  			(readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 2) );
  
  		if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
  			ret = -EFAULT;
  		break;
  	case 2:
  		pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
  		for (i = 0; i < 10; i++)
  			writeb(0xff, pmem++);
  		writeb(adgl->data_from_pc_ready, 
  		       apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
  
  		writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
  		
  		for (i = 0; i < MAX_BOARD; i++) {
  			if (apbs[i].RamIO) {
  				byte_reset_it = readb(apbs[i].RamIO + RAM_IT_TO_PC);
  			}
  		}
  		break;
  	case 3:
  		pmem = apbs[IndexCard].RamIO + TIC_DES_FROM_PC;
  		writeb(adgl->tic_des_from_pc, pmem);
  		break;
  	case 4:
  		pmem = apbs[IndexCard].RamIO + TIC_OWNER_TO_PC;
  		adgl->tic_owner_to_pc     = readb(pmem++);
  		adgl->numcard_owner_to_pc = readb(pmem);
  		if (copy_to_user(argp, adgl,sizeof(struct st_ram_io)))
  			ret = -EFAULT;
  		break;
  	case 5:
  		writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
  		writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
  		writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
  		writeb(4, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
  		writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
  		break;
  	case 6:
  		printk(KERN_INFO "APPLICOM driver release .... V2.8.0 ($Revision: 1.30 $)
  ");
  		printk(KERN_INFO "Number of installed boards . %d
  ", (int) numboards);
  		printk(KERN_INFO "Segment of board ........... %X
  ", (int) mem);
  		printk(KERN_INFO "Interrupt IRQ number ....... %d
  ", (int) irq);
  		for (i = 0; i < MAX_BOARD; i++) {
  			int serial;
  			char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
  
  			if (!apbs[i].RamIO)
  				continue;
  
  			for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
  				boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
  			boardname[serial] = 0;
  
  			printk(KERN_INFO "Prom version board %d ....... V%d.%d %s",
  			       i+1,

  			       (int)(readb(apbs[i].RamIO + VERS) >> 4),
  			       (int)(readb(apbs[i].RamIO + VERS) & 0xF),

  			       boardname);
  
  
  			serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) + 
  				(readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) + 
  				(readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
  
  			if (serial != 0)
  				printk(" S/N %d
  ", serial);
  			else
  				printk("
  ");
  		}
  		if (DeviceErrorCount != 0)
  			printk(KERN_INFO "DeviceErrorCount ........... %d
  ", DeviceErrorCount);
  		if (ReadErrorCount != 0)
  			printk(KERN_INFO "ReadErrorCount ............. %d
  ", ReadErrorCount);
  		if (WriteErrorCount != 0)
  			printk(KERN_INFO "WriteErrorCount ............ %d
  ", WriteErrorCount);
  		if (waitqueue_active(&FlagSleepRec))
  			printk(KERN_INFO "Process in read pending
  ");
  		for (i = 0; i < MAX_BOARD; i++) {
  			if (apbs[i].RamIO && waitqueue_active(&apbs[i].FlagSleepSend))
  				printk(KERN_INFO "Process in write pending board %d
  ",i+1);
  		}
  		break;
  	default:

  		ret = -ENOTTY;

  		break;
  	}
  	Dummy = readb(apbs[IndexCard].RamIO + VERS);
  	kfree(adgl);

  	mutex_unlock(&ac_mutex);

  	return 0;
  }